I've driven my car like this on occasion, preserving fuel by timing the traffic signals ahead and arriving just in time for the signal to turn green. The problem is, people behind me don't understand and get all pissed off. Most people prefer to arrive at the light when it turns red, to buy high & sell low, etc. We love doing everything in the most inefficient way possible. I imagine sea captains won't like the plan much either, for similar reasons.